Question
Farmer Michael has 4 ducks. The mass of Duck B is the same as the average mass of the 4 ducks. Duck C weighs 9 kg less than the average mass of the 4 ducks. The mass of Duck D is 10 kg more than the average mass of the 4 ducks. The mass of Duck E is 6 kg. Find the total mass of the 4 ducks.
3 m

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Farmer Michael has 4 ducks. The mass of Duck B is the same as the average mass of the 4 ducks. Duck C weighs 9 kg less than the average mass of the 4 ducks. The mass of Duck D is 10 kg more than the average mass of the 4 ducks. The mass of Duck E is 6 kg. Find the total mass of the 4 ducks.